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Diisobutyl Adipate
AKA “Bis(2-methylpropyl) hexanedioate, Isobutyl adipate, Ftaflex DIBA, Adipic acid, diisobutyl ester, Hexanedioic acid, bis(2-methylpropyl) ester, Plasthall DIBA”
Synthetic
Ingredient Facts
Diisobutyl adipate
AKA: Bis(2-methylpropyl) hexanedioate, Ftaflex DIBA, Adipic acid, Diisobutyl ester, Hexanedioic acid, Bis(2-methylpropyl) ester, Plasthall DIBA
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Solvent
Skin Conditioner
Synthetic
Clean
A lightweight softening agent that helps product texture feel smooth and luxurious on skin while keeping formulas stable and blended.
Solubility Sol in most org solvents; insol in water
Formula
C14H26O4
Mol. Weight
258.35
CAS #
141-04-8
Form
Liquid
State
Liquid
See origin →
Functions
Plasticiser
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Locks In Moisture
Traditional Use
Synthetic plasticizer and emollient developed for cosmetic use in the mid-20th century. Created to improve product spreadability and skin conditioning properties.
Skin Types
●all-skin-types
Best For
Dryness
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USAunder review
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Final Report on the Safety Assessment of Adipic Acid Dihydrazide
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
1,4-Butanediol/Succinic Acid/Adipic Acid/HDI Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Adipic Acid
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Adipic Acid/CHDM/MA/Neopentyl Glycol/Trimellitic Anhydride Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Diisobutyl Adipate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Trimethylpentanediol/Adipic Acid/Glycerin Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Adipic Acid
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Diisobutyl Adipate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Trimethylpentanediol/Adipic Acid/Glycerin Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Toxicity of adipic acid.
Kennedy GL Jr
Drug and chemical toxicology, 2002
→
Allergic Contact Dermatitis to Trimethylpentanediol/Adipic Acid/Glycerin Crosspolymer in a Lip Balm.
Lockmann A, Schill T, Schubert S, Buhl T
Contact dermatitis, 2026
→
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR